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Originally Posted by ERA 778
Hey guys:
A quick question on dialing in the bellhousing. Is it 0.005" total indicated runout or is it plus or minus 0.005"? I just checked mine today (new Quicktime on a 428 FE) and I've got 0.008" TIR. That's close, I know, but if the spec. is 0.005" TIR, I'm going to have to do some work!
Thanks,
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I'm trying to remember what Doug at ERA told me they liked to see, and I'm pretty darn sure it was less than the oft-quoted .005 number. But I just can't remember. But here's a quote from the Kirkhams on it. Apparently they like to get down below that number as well. If you click on the link below that will take you to their assembly manual page where they did a dial in on a bellhousing and where I grabbed that quote.
Quote:
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The bell housing needs to be centered to within 0.005 TIR or Total Indicator Reading. This reading is 0.006 TIR in the up and down axis and 0.003 in the right and left axis. We try to get them to 0.002-0.003 TIR. So we will move the bell housing slightly.
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Kirkham Motorsports Assembly Manual